import base64
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from Crypto.Cipher import AES
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def aes_encrypt(word: str, key_str: str, iv_str: str) -> str:
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# 将密钥和IV转换为UTF-8编码的字节
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key = key_str.encode('utf-8')
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iv = iv_str.encode('utf-8')
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# 将明文转换为UTF-8编码的字节
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data = word.encode('utf-8')
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# 计算ZeroPadding填充
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block_size = AES.block_size
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padded_len = (len(data) + block_size - 1) // block_size * block_size
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padding = padded_len - len(data)
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padded_data = data + bytes([0] * padding)
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# 创建AES-CBC加密器
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cipher = AES.new(key, AES.MODE_CBC, iv)
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# 执行加密
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encrypted_data = cipher.encrypt(padded_data)
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# 返回Base64编码的密文
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return base64.b64encode(encrypted_data).decode('utf-8')
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